What is the principle of the decarburization flash tank?
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Why is it called pressure-reducing flash evaporation? Could it be related to stress?
The solubility of gases in a solution is proportional to their partial pressure; therefore, most of the dissolved gases can be removed by reducing the pressure.
Physical absorption is favored by increased pressure and reduced temperature, while desorption is favored by reduced pressure and increased temperature; however, the pressure cannot be lowered too much. During the decarburization flash regeneration of propylene carbonate, the pressure is reduced from 1.7 MPA to 0.35–0.4 MPA, and almost all of the hydrogen and nitrogen in the rich liquid are desorbed at this point, with only a small amount of CO2 being desorbed.
Is there a more detailed explanation?
I’ve forgotten whether it’s Raoult’s law or Henry’s law; in short, the solubility of a gas is related to the pressure exerted above that gas in the solution. Reducing the pressure causes the gas dissolved in the solution to come out. That’s roughly what it means
Reducing pressure facilitates CO2 regeneration; each chamber of the flash tank is equipped with an ejector, which enables more thorough CO2 regeneration.